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One of the orchestrators of last week’s protests against the Saudi crown prince’s visit to Britain has spread anti-Semitic conspiracy theories on social media and recently described a notorious Lebanese terrorist as a “hero”, the Telegraph can disclose.

Ahmed Almoaiad, whose human rights group was listed as an organiser of the demonstrations, said the doctrine behind Islamic State of Iraq and the Levant (Isil) was created by Jews.

He separately posted a cartoon depicting Jews controlling the US and another image bearing the slogan “Death to America”.

Another prominent protester, Asaad Al-Shareey, who was stopped by police as he prepared to throw eggs at Crown Prince Mohammed bin Salman, has described...